Lauermannová Anna-Marie, Antončík Filip, Lojka Michal, Jankovský Ondřej, Pavlíková Milena, Pivák Adam, Záleská Martina, Pavlík Zbyšek
Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Technická 5, 166 28 Prague, Czech Republic.
Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech Republic.
Materials (Basel). 2020 Dec 14;13(24):5708. doi: 10.3390/ma13245708.
A high-performance magnesium oxychloride cement (MOC) composite composed of silica sand, diatomite powder, and doped with graphene nanoplatelets was prepared and characterized. Diatomite was used as a 10 vol.% replacement for silica sand. The dosage of graphene was 0.5 wt.% of the sum of the MgO and MgCl·6HO masses. The broad product characterization included high-resolution transmission electron microscopy, X-ray diffraction, X-ray fluorescence, scanning electron microscopy and energy dispersive spectroscopy analyses. The macrostructural parameters, pore size distribution, mechanical resistance, stiffness, hygric and thermal parameters of the composites matured for 28-days were also the subject of investigation. The combination of diatomite and graphene nanoplatelets greatly reduced the porosity and average pore size in comparison with the reference material composed of MOC and silica sand. In the developed composites, well stable and mechanically resistant phase 5 was the only precipitated compound. Therefore, the developed composite shows high compactness, strength, and low water imbibition which ensure high application potential of this novel type of material in the construction industry.
制备并表征了一种由硅砂、硅藻土粉末组成且掺杂了石墨烯纳米片的高性能氯氧化镁水泥（MOC）复合材料。硅藻土用作硅砂10体积%的替代品。石墨烯的用量为MgO和MgCl₂·6H₂O质量总和的0.5重量%。广泛的产品表征包括高分辨率透射电子显微镜、X射线衍射、X射线荧光、扫描电子显微镜和能谱分析。对成熟28天的复合材料的宏观结构参数、孔径分布、机械抗性、刚度、湿学和热学参数也进行了研究。与由MOC和硅砂组成的参考材料相比，硅藻土和石墨烯纳米片的组合大大降低了孔隙率和平均孔径。在开发的复合材料中，稳定且机械抗性良好的相5是唯一沉淀的化合物。因此，开发的复合材料显示出高致密性、高强度和低吸水性，这确保了这种新型材料在建筑行业具有很高的应用潜力。
